HY3842 - Hooyi

HY3842 (HY3842 / HY3845) PWM controller

The HY3842D-N/3843D-N/3844D-N/3845D-N, are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, cu.

Features

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• Low Start-Up and Operating Current High Current Totem Pole Output Under voltage Lockout With Hysteresis Operating Frequency Up To 500KHz BLOCK DIAGRAM (toggle flip flop used only in HY3844, HY3845) Absolute Maximum Ratings Characteristic Supply Voltage (low impedance source) Output Current Input Voltage (Analog Inputs pins 2,3) Error Amp Output Sink Current Power Dissipation (TA=25 C) Storage Temperature Range Lead Temperature (soldering 5 sec.) 0 Symbol VCC IO VI ISINK (E.A) PO Tstg TL Value 30 ±1 −0.3 to 5.5 10 1 -65 to150 260 Unit V A V mA W o o C C 1 www.hooyi-semi.com Fre.